EP3086044B1 - Kochgerat, das einen pyrolytischen reinigungszyklus durchführt und entsprechendes reinigungsverfahren - Google Patents

Kochgerat, das einen pyrolytischen reinigungszyklus durchführt und entsprechendes reinigungsverfahren Download PDF

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Publication number
EP3086044B1
EP3086044B1 EP16165786.1A EP16165786A EP3086044B1 EP 3086044 B1 EP3086044 B1 EP 3086044B1 EP 16165786 A EP16165786 A EP 16165786A EP 3086044 B1 EP3086044 B1 EP 3086044B1
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Prior art keywords
temperature
cooking
pyrolysis
cycle
cleaning
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English (en)
French (fr)
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EP3086044A1 (de
Inventor
Abdelaâziz BOUIRDENE
Laurent GRAPAIN
Sylvain Raimond
Valérie RAMDANE
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Groupe Brandt SAS
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Groupe Brandt SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes

Definitions

  • the present invention relates to a cooking appliance comprising a cavity, such as a cooking oven, implementing a pyrolysis cleaning cycle.
  • the invention also relates to a method of cleaning by pyrolysis.
  • the temperature in the cavity increases progressively from an initial temperature, generally room temperature, to a temperature, called the pyrolysis temperature. Once the cavity reaches the pyrolysis temperature, the temperature is maintained for a predetermined period of time in order to destroy the grease and dirt deposited on the walls forming the cavity.
  • the pyrolysis cycle comprises a first phase in which the temperature of the cavity increases from the initial temperature to the pyrolysis temperature (generally a temperature between 480 ° C and 500 ° C) according to a temperature curve representative of the change in temperature over time and a second phase in which the cavity is maintained at the pyrolysis temperature.
  • the same cooking appliance can implement cleaning cycles by pyrolysis having different durations, depending for example on a selection made by a user.
  • a pyrolysis cleaning cycle lasts approximately 90 to 150 minutes.
  • the duration of the first phase is equal for all cycles and the second phase varies according to the pyrolysis cleaning cycle used, generally according to the degree of soiling of the cavity.
  • the document EP 0 632 232 discloses an oven implementing a pyrolysis cleaning cycle.
  • the pyrolysis cleaning cycle is implemented following a cooking cycle in order to take advantage of the thermal inertia of the cavity being at a temperature high compared to the ambient temperature.
  • the time required for the cavity to reach the pyrolysis temperature is shorter than when the pyrolysis cleaning cycle begins with the cavity. at room temperature.
  • the object of the present invention is to further optimize the duration of a pyrolysis cleaning cycle while obtaining a good cleaning result.
  • the invention aims, according to a first aspect, a cooking appliance comprising a cavity and means for implementing a cleaning cycle by pyrolysis in which the temperature of the cavity increases from an initial temperature to at a pyrolysis temperature, the rise in temperature over time being implemented according to a first temperature curve, representative of the change in temperature over time.
  • the means for implementing a pyrolysis cycle comprise means for verifying the prior implementation of a cooking cycle comprising means for determining the period of time elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle and means for comparing the determined period of time with a predetermined period of time
  • the means for implementing a pyrolysis cycle further comprising comparison means to compare said initial temperature to a predetermined temperature, and are configured to implement the temperature rise over time according to said first temperature curve when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the temperature initial temperature is greater than or substantially equal to the predetermined temperature
  • the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature interval.
  • the pyrolysis cleaning cycle is implemented after the implementation of a cooking cycle and the temperature of the cavity is higher than the predetermined temperature, the temperature rise is faster.
  • the pyrolysis cleaning cycle is therefore shorter than when the cycle starts with a cavity lower than the predetermined temperature, for example room temperature.
  • the pyrolysis cycle time is shortened.
  • the heat is homogeneous throughout the cavity, in particular in the walls surrounding the cavity.
  • the cooking appliance comprising a catalyst for neutralizing the fumes produced in the cavity during the pyrolysis cleaning cycle
  • the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature. up to a catalyst activation temperature, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, said temperature interval corresponding substantially to the second part of the pyrolysis cleaning cycle.
  • the enamel covering the walls forming the cavity being already hot, it is possible to increase the temperature in the cavity quickly without risk of breakage of the enamel.
  • the cooking appliance comprises an extraction fan for extracting the fumes produced in the cavity during the cleaning cycle by pyrolysis, and means for controlling the extraction fan configured to control the operating fan. extraction at a rotational speed, the rotational speed of the extraction fan being a function of the temperature of the cavity.
  • the extraction fan control means are configured to put the extraction fan into operation at a minimum speed of rotation when the cavity is at the initial temperature and to increase the speed of rotation of the extraction fan when the temperature of the cavity increases.
  • the extraction of fumes from the fats burnt during pyrolysis is reduced at the start of the cleaning cycle by pyrolysis.
  • the catalyst is not activated and the fumes are not neutralized. Therefore, thanks to this functionality, the extraction fan starts its operation at a reduced speed of rotation in order to reduce the extraction of fumes while waiting for the catalyst to be active in order to be able to neutralize odors and fumes.
  • the means for implementing a pyrolysis cleaning cycle include heating means configured so that the temperature of the cavity increases according to the first temperature curve or according to the second temperature curve.
  • the means for implementing the pyrolysis cleaning cycle include means for verifying the prior implementation of a cooking cycle and comparison means for comparing the initial temperature with the predetermined temperature.
  • the predetermined temperature is substantially equal to 100 ° C.
  • the initial temperature has a value substantially greater than 100 ° C or equal to 100 ° C, and a prior firing cycle has conferred thermal inertia on the walls of the cavity, the risk of breakage of the enamel covering the walls of the cavity during a rapid rise in the temperature of the cavity is minimized.
  • the means for verifying the prior implementation of a cooking cycle include comparison means for comparing a cooking temperature with a predetermined cooking temperature.
  • the means for implementing a pyrolysis cleaning cycle can implement the temperature rise according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature.
  • the means for verifying the prior implementation of a cooking cycle include means for comparing a cooking time of said cooking cycle with a predetermined cooking time.
  • the means for implementing a pyrolysis cleaning cycle can implement the temperature rise over time according to the second curve when a cooking time is greater than or equal to a cooking time. predetermined.
  • the means for implementing the cleaning cycle by pyrolysis include means for determining the period of time elapsed between the end of said at least one cooking cycle and the start of the cleaning cycle by pyrolysis and means comparing the determined period of time with a predetermined period of time.
  • the cooking appliance thus comprises means configured to check whether the temperature of the cavity, as well as of the walls which surround it, are at a uniform temperature and sufficiently high so that the rise in temperature can be implemented according to the second temperature curve without risk of breakage of the enamel of the walls surrounding the cavity.
  • the means for implementing a pyrolysis cleaning cycle implement the temperature rise according to the second temperature curve when the period of time elapsed between the end of said at least one cooking cycle and the start of the pyrolysis cleaning cycle is less than or substantially equal to a predetermined period.
  • the cooking apparatus is a cooking oven.
  • the present invention relates to a pyrolysis cleaning process for a cooking appliance comprising a cavity and implementing a pyrolysis cleaning cycle in which the temperature of the cavity increases from an initial temperature to a pyrolysis temperature, the temperature rise over time being implemented according to a first temperature curve representative of the change in temperature over time.
  • the method of cleaning by pyrolysis comprises the verification of the prior implementation of a cooking cycle and the comparison of the initial temperature with a predetermined temperature, the verification comprising a step of determining the period of time. elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle, and a step of comparing the determined elapsed period of time with a predetermined period of time, the temperature rise over time being implemented according to said first curve temperature when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the initial temperature is higher or substantially equal to the predetermined temperature, the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature range.
  • the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature to an activation temperature of a catalyst neutralizing the fumes produced in the cavity during the cleaning cycle. by pyrolysis, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, the temperature interval corresponding substantially to the second part of the cleaning cycle by pyrolysis.
  • the pyrolysis cleaning process comprises the control of a fan for extracting the fumes produced in the cavity during the pyrolysis cleaning cycle, at a speed of rotation depending on the temperature of the cavity.
  • control of the extraction fan comprises starting the extraction fan at a minimum speed of rotation when the cavity is at the initial temperature, the speed of rotation of the extraction fan increasing when the temperature of the cavity increases.
  • the pyrolysis cleaning process comprises the operating control of the heating means for a predetermined period of time and at a predetermined power so that the temperature of the cavity increases according to the first temperature curve or the second. temperature curve.
  • the method of cleaning by pyrolysis comprises checking the prior implementation of a cooking cycle and comparing the initial temperature with the predetermined temperature.
  • the temperature rise over time can be implemented according to the second temperature curve when said determined period of time is less than a predetermined period.
  • the verification of the prior implementation of a cooking cycle comprises the comparison of a cooking temperature during the preliminary cooking cycle with a predetermined cooking temperature.
  • the temperature rise over time can be implemented according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature.
  • the verification of the prior implementation of a cooking cycle comprises determining the cooking time of the cooking cycle, and comparing the determined cooking time with a predetermined cooking time.
  • the temperature rise can be implemented according to the second temperature curve when the cooking time is greater than or substantially equal to a predetermined cooking time.
  • the predetermined cooking temperature is substantially equal to 140 °.
  • each cooking cycle having an associated partial cooking time, said cooking times corresponding to the sum of said several partial cooking times when the temperature of the cavity is higher. at the predetermined temperature between the implementation of the cooking cycles.
  • the pyrolysis cleaning process has characteristics and advantages similar to those described above in relation to the cooking appliance.
  • the present invention finds its application in a cooking appliance comprising a cavity, such as a cooking oven or a stove.
  • the figure 1 illustrates a profile drawing of a baking oven 1 having pyrolysis cleaning functionality.
  • the baking oven 1 comprises a cavity 2 formed by a set of walls 2a, 2b, 2c, as well as by the door 3 of the baking oven.
  • the set of walls 2a, 2b, 2c as well as the door 3 of the baking oven 1 forming the cavity 2, constitute the muffle of the baking oven 1.
  • the baking oven 1 further comprises a catalyst 4 having the functionality of neutralizing fumes and odors produced in the cavity 2 during the cleaning cycle by pyrolysis.
  • the catalyst 4 is located in this embodiment on the upper wall 2a.
  • An extraction fan 6 is placed in an exhaust duct 5.
  • the extraction fan 6 makes it possible to extract the fumes produced in the cavity 2 during the cleaning cycle by pyrolysis.
  • the exhaust duct 5 connects the interior of the baking oven 1, in particular the cavity 2, with the exterior.
  • the extraction fan 6 also allows the cooling of certain parts of the cooking 1, ensuring in particular the cooling of the door 3, as well as of the electronic card (not shown) comprising in particular electrical circuits configured to manage the operation of the cooking oven 1.
  • the extraction of fumes generated during the pyrolysis cleaning cycle is carried out by the venturi effect.
  • the air movement sucks in the fumes from the catalyst 4.
  • the fumes and odors pass through the catalyst 4 leading to the exhaust duct 5a, and are then stirred and directed by the exhaust fan 6 towards the exhaust duct 5 which leads them outside the baking oven 1. .
  • the baking oven 1 comprises heating means arranged on the upper part of the cavity 2 and on the lower part of the cavity 2.
  • These heating means comprise in an exemplary embodiment a high resistance 7a and a low resistance 7b.
  • the high resistance 7a is located inside the cavity 2 and the low resistance 7b is located outside the cavity 2. This low resistance 7b heats the lower wall 2c.
  • the high resistance 7a and the low resistance 7b are used in order to heat the cavity 2 during the cooking modes and during the pyrolysis cleaning cycle.
  • the high resistor 7a has a maximum power of 2100 watts and the low resistor 7b has a maximum power of 1200 watts.
  • the baking oven 1 also includes a mixing fan 8 placed in the cavity 2.
  • This mixing fan 8 can be used during the so-called “rotating heat” cooking modes or for certain phases of the pyrolysis cleaning cycle.
  • the mixing fan 8 is here considered to form part of the heating means.
  • the heating means 7a, 7b, 8 are configured so that the temperature of the cavity 2 changes over time according to the first temperature curve temp1 or the second temperature curve temp2.
  • the baking oven 1 further comprises at least one temperature probe (not shown in the figure) for measuring the temperature inside the baking oven 1.
  • the baking oven 1 has a temperature probe located in the upper part of the baking oven 1.
  • the temperature of cavity 2 refers to the temperature at the center of cavity 2.
  • the cooking appliance 1 further comprises control and command means (not shown in the figure) managing the operation of the cooking appliance 1, and in particular the operation of the means used during the implementation of a pyrolysis cleaning cycle.
  • the figure 2 represents a first temperature curve temp1 and a second temperature curve temp2.
  • a temperature curve represents the change in temperature T of cavity 2 over time t during the implementation of a cleaning cycle by pyrolysis.
  • the first temperature curve temp1 represents a rise in temperature T over time t. This temperature curve t emp1 is followed when the cavity 2 is at a temperature below a predetermined temperature. In the example illustrated, the temperature of the cavity 2 is an ambient temperature.
  • the second temperature curve temp2 represents a rise in temperature T over time t when a cooking cycle has been previously implemented and when the pyrolysis cleaning cycle begins, the cavity 2 is at an initial temperature T i greater than the predetermined temperature.
  • this initial temperature T i is around 160 ° C.
  • cleaning is carried out by pyrolysis after a cooking cycle and the predetermined temperature has a value substantially equal to 100 ° C.
  • the value of 100 ° C was defined empirically so that the temperature rise of the muffle benefits from good thermal inertia while minimizing the risk of enamel breakage.
  • the predetermined temperature could have other values.
  • a pyrolysis cleaning cycle comprises a first phase A1, A2 in which the temperature T of the cavity 2 increases progressively from an initial temperature T i to the pyrolysis temperature T p and a second phase B1, B2 in which the temperature T p pyrolysis is maintained.
  • the initial temperature T i is substantially equal to the ambient temperature or external temperature of the cooking oven 1.
  • This ambient temperature can thus vary within a range of values between 15 ° C and 35 ° C and has a typical value of 20 ° C.
  • the initial temperature T i is of course higher than the ambient temperature.
  • the pyrolysis temperature T p has a value between 480 ° and 500 °.
  • the first phase A1, A2 of the cycle by pyrolysis comprises a first part A1i-c, A2i-c in which the temperature of the cavity 2 increases from the initial temperature T i to the activation temperature T c of the catalyst 4, and a second part A1c-p, A2c-p in which the temperature of cavity 2 increases from the activation temperature T c of catalyst 4 to the pyrolysis temperature T p .
  • activation temperature T c of catalyst 4 is understood to mean the temperature above which catalyst 4 is sufficiently hot to catalyze the fumes produced during a cycle of cleaning by pyrolysis.
  • the activation temperature T c of catalyst 4 is between 250 ° C and 350 ° C.
  • pyrolysis temperature T p is understood to mean the temperature at which cavity 2 must be maintained in order to effectively decompose the organic compounds.
  • the pyrolysis temperature T p is arbitrarily defined and is higher than the theoretical temperature from which the decomposition reaction of organic compounds begins.
  • the temperature of the cavity 2 increases over time according to the first temperature curve temp1.
  • the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the first temperature curve temp1.
  • the temperature of the cavity 2 increases from the initial temperature T i to the pyrolysis temperature T p according to the second temperature curve temp2.
  • the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the second temperature curve temp2.
  • the second temperature curve temp2 comprises at least one substantially linear portion temp2 (1) corresponding to a temperature interval I T.
  • the temperature interval I T corresponds substantially to the temperatures at the start and at the end of the second part A1c-p, A2c-p of the pyrolysis cleaning cycle, that is to say that the temperature interval I T corresponds to the interval between the activation temperature T c of catalyst 4 and the pyrolysis temperature T p .
  • the portion temp2 (1) of the second temperature curve temp2 has a slope a2 of a value greater than the value of the slope ⁇ 1 of a portion temp1 (1) of the first temperature curve temp1 corresponding to the same temperature interval I T .
  • the pyrolysis temperature T p is reached more quickly when the temperature rise is implemented according to the second temperature curve temp2.
  • the extraction fan 6 operates at a speed of rotation which is a function of the temperature of the cavity 2.
  • the operation of the extraction fan 6 is controlled by control means (not shown in the figures) of the extraction fan 6.
  • the extraction fan 6 is put into operation at a minimum speed of rotation when the cavity 2 is at the initial temperature T i .
  • control means activate the extraction fan 6 at a higher speed of rotation.
  • the extraction fan 6 operates at a first speed of rotation corresponding to the speed of minimum rotation, and in the second part A1c-p, A2c-p of the first phase A1, A2 of the pyrolysis cleaning cycle, the extraction fan 6 operates at a second speed of rotation which is higher than the speed of minimum rotation.
  • the speed of rotation of the extraction fan 6 increases progressively and proportionally to the increase in the temperature of the cavity 2 from the initial temperature T i to the pyrolysis temperature T p .
  • the speed of rotation of the exhaust fan 6 can increase in stages or linearly.
  • the speed of rotation of the extraction fan 6 has a minimum value when the temperature is lower than a predefined temperature, for example of a value substantially equal to 200 ° C.
  • extraction fan 6 must operate at a minimum speed in order to ensure its cooling function.
  • the speed of rotation can increase linearly when the temperature increases between the first predefined temperature and the pyrolysis temperature T p (approximately 500 ° C.).
  • the speed of rotation of the extraction fan is 45% of its maximum rotational speed and increases linearly until cavity 2 has a temperature substantially lower than the pyrolysis temperature T p , for example 494 ° C, the rotational speed is then 76% of its maximum rotational speed.
  • the speed of rotation of the extraction fan 6 operates at its maximum speed of rotation.
  • the baking oven 1 further comprises means for verifying the prior implementation of a baking cycle and comparison means (not shown in the figures) for comparing the initial temperature T i of the cavity 2 at the predetermined temperature.
  • the means for verifying the prior implementation of a cooking cycle include comparison means (not shown) for comparing a cooking temperature T u of the preliminary cooking cycle, with a predetermined cooking temperature.
  • the predetermined cooking temperature T u has, for example, a value of 140 ° C.
  • This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.
  • the baking oven 1 further comprises storage means in which the baking temperature T u in a baking cycle is stored.
  • the stored cooking temperature T u can be the setpoint temperature for the cooking cycle.
  • the stored cooking temperature T u can be the temperature measured during the cooking cycle.
  • the means for verifying the prior implementation of a cooking cycle comprise means for determining the cooking time and means for determining the period of time elapsed between the end of a cooking cycle and the start of a pyrolysis cleaning cycle, as well as means for comparing the cooking time with a predetermined cooking time and means for comparing said determined period of time with a period of predetermined time.
  • the heating means are configured so that the temperature of the cavity 2 follows a temperature curve temp1, temp2 over time t .
  • the temperature rise of the cavity 2 is implemented according to said temperature curve.
  • the heating means comprise in particular the high resistance 7a, the low resistance 7b and the mixing fan 8.
  • the heating means 7a, 7b, 8 are controlled in operation so that the temperature in the cavity 2 increases in time t according to the second temperature curve temp2.
  • the high resistor 7a is supplied at 83% of its maximum power (here 1750 watts).
  • the high resistor 7a is supplied at full power, that is to say at 100% of its power (2100 watts in this example)
  • the low resistor 7b is supplied at 80% of its power (here 960 watts) and the brewing fan 8 is activated.
  • control means managing the operation of the oven control the maintaining the temperature of the cavity 2 at the pyrolysis temperature T p (for example 492 °).
  • the means of heating 7a, 7b, 8 are controlled in operation so that the temperature of cavity 2 increases in time t according to the first temperature curve temp1.
  • the heating means 7a, 7b, 8 are put into operation as follows.
  • the high resistance 7a is supplied to 83% of its maximum power (here 1750 watts).
  • the high resistor 7a is activated at 100% of its maximum power (for example 2100 watts) for a first predefined period then deactivated for a second predefined period the first predefined period has a value of 50 seconds and the second preset period has a value of 10 seconds.
  • the high resistance 7a is activated periodically every 50 seconds out of 60 seconds, which allows an average power supply at 83% of its maximum power.
  • the second part A1c-p of the first phase A1 of the pyrolysis cleaning cycle is divided into three partial phases.
  • the high resistance 7a operates, as for the first part A1ic of the first phase A1, at 83% of its maximum power and the low resistor 7b is operating at 33% of its maximum power, for example by operating at full power periodically for 20 seconds out of 60 seconds.
  • the high resistance 7a is activated at 80%, for example by feeding it. at full power periodically for 48 seconds out of 60 seconds and the low resistance 7b is activated at full power (here 1200 watts)
  • the high resistor 7a is put into operation at full power
  • the low resistor 7b is put into operation at full power periodically for 48 seconds out of 60 seconds (i.e. 80% of its maximum power)
  • the circulation fan 8 is activated.
  • the control means managing the operation of the baking oven 1 control the maintenance of the temperature of the cavity 2 at the pyrolysis temperature T p , for example at 492 ° C.
  • the predefined periods of activation of the heating means 7a, 7b, 8, as well as the heating powers may be different in order to be able to reproduce the temperature curves temp1, temp2.
  • the figure 3 represents an embodiment of a pyrolysis cleaning process according to the invention.
  • the pyrolysis cleaning process implemented in a cooking appliance 1, such as a cooking oven such as that shown in FIG. figure 1 includes a step of verifying the prior implementation of a cooking cycle E1.
  • the pyrolysis cleaning process further comprises a step of comparison E2 of the initial temperature T i of the cavity 2 with a predetermined temperature.
  • the predetermined temperature has a value of 100 ° C.
  • This value of 100 ° C was determined empirically so that the rise in temperature takes advantage of the thermal inertia of the muffle, and can, of course, have other different values.
  • the rise in temperature is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the second temperature curve temp2 .
  • the verification E1 of the prior implementation of a cooking cycle comprises a step of comparison E3 of a cooking temperature T u with a predetermined cooking temperature.
  • This cooking temperature T u corresponds to the cooking temperature of the cooking cycle prior to the pyrolysis cleaning cycle.
  • the cooking temperature T u can for example be set by a user of the cooking oven 1 by means of a man-machine interface comprising control devices and displays or can be automatically defined by a computer in a specific cooking mode. .
  • the predetermined cooking temperature has, for example, a value of 140 ° C.
  • This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature of the cavity 2 does not have a sufficient value for the temperature rise during the pyrolysis cleaning cycle to take advantage of thermal inertia.
  • the temperature rise over time is implemented according to the second curve temperature temp2.
  • the verification E1 of the prior implementation of a cooking cycle comprises a step of determining the cooking time of the cooking cycle implemented prior to the pyrolysis cleaning cycle, as well as a comparison step E4 of the determined cooking time with a predetermined cooking time t c .
  • the temperature rise is implemented according to the second temperature curve temp2.
  • the cooking temperature T u is at least 140 ° C.
  • determining the cooking time is equivalent to determining the time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature (here of 140 ° C.).
  • the temperature is implemented according to the first temperature curve temp1.
  • the predetermined cooking time t c is 25 min.
  • the baking time has been determined empirically so that the cavity 2 of the baking oven 1 operated at a baking temperature T u of at least 140 ° C has thermal inertia when the temperature rise follows the second curve temperature temp2.
  • the predetermined cooking time t c can be made up of several partial cooking times associated with different cooking cycles implemented for a period less than the predetermined cooking time t c .
  • the temperature of the cavity 2 between cooking cycles must not drop from the predetermined temperature (here by 100 ° C).
  • these 15 min cooking times form a single cooking time when the temperature of cavity 2 is above the predetermined temperature during and between the implementation of the three cooking cycles.
  • step E1 it is verified that a cooking cycle has been implemented at a minimum cooking temperature and / or during a minimum cooking time in order to benefit from the thermal inertia of the mitten.
  • comparison steps E2, E3, E4 can be implemented in the aforementioned order, or in any other order.
  • the cleaning method can be implemented according to several embodiments.
  • the method of cleaning by pyrolysis comprises the step of comparing an initial temperature T i with the predetermined temperature E2 as well as the step E3 of comparing the cooking temperature T u with the cooking temperature predetermined.
  • it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, the step E3 of comparing the cooking temperature T u with the predetermined cooking temperature, and the comparison step E4 of the cooking time with the predetermined cooking time t c .
  • it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, and the step E4 of comparing the cooking time with the predetermined cooking time t c .
  • the method of cleaning by pyrolysis may further comprise a step of determining (not shown) the period of time elapsed between the end of a cooking cycle and the start of a cycle of cleaning by pyrolysis, as well as a step comparing this determined elapsed time period with a predetermined time period.
  • the temperature rise is implemented according to the second temperature curve temp2.
  • the temperature rise is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1 .
  • the pyrolysis cleaning process comprises the step of checking the cooking temperature T u with the predetermined cooking temperature, when the cooking temperature T u is lower than the predetermined cooking temperature, the temperature rise over time is implemented according to the first temperature curve temp1.
  • the pyrolysis cleaning process may further include a cooking time check, and includes checking the time period between the end of a cooking cycle and the start of a pyrolysis cleaning cycle.
  • the cooking temperature in a cooking cycle is at least 140 ° C.
  • the cooking time is equivalent to the cooking time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature.
  • the temperature rise is implemented according to the first temperature curve temp1.
  • the initial temperature T i of the cavity 2 is greater than or substantially equal to the predetermined temperature and that the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature and / or that the cooking time is greater than or substantially equal to the predetermined cooking time t c
  • the temperature rise over time is implemented according to the second temperature curve time 2.

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  • Baking, Grill, Roasting (AREA)

Claims (19)

  1. Gargerät mit einem Hohlraum (2) und Mitteln zur Durchführung eines Reinigungszyklus durch Pyrolyse, bei dem die Temperatur des Hohlraums von einer Anfangstemperatur (Ti) auf eine Pyrolysetemperatur (Tp) ansteigt, wobei der zeitliche Temperaturanstieg gemäß einer ersten Temperaturkurve (temp1) erfolgt, die für den zeitlichen Verlauf der Temperatur repräsentativ ist, wobei das Gargerät (1) dadurch gekennzeichnet ist, dass die Mittel zur Durchführung eines Pyrolysezyklus Mittel zur Überprüfung der vorherigen Durchführung eines Garzyklus umfassen, die Mittel zur Bestimmung der zwischen dem Ende eines Garzyklus und dem Beginn des Pyrolyse-Reinigungszyklus verstrichenen Zeitspanne und Mittel zum Vergleichen der bestimmten Zeitspanne mit einer vorbestimmten Zeitspanne umfassen, wobei die Mittel zur Durchführung eines Pyrolysezyklus ferner Vergleichsmittel zum Vergleichen der Anfangstemperatur (Ti) mit einer vorbestimmten Temperatur umfassen und dazu ausgelegt sind, dass der zeitliche Temperaturanstieg gemäß der ersten Temperaturkurve (temp1) dann erfolgt, wenn die Anfangstemperatur (Ti) niedriger als die vorbestimmte Temperatur ist, und gemäß einer zweiten Temperaturkurve (temp2), die für den zeitlichen Verlauf der Temperatur repräsentativ ist, dann erfolgt, wenn zuvor ein Garzyklus durchgeführt worden ist und wenn die Anfangstemperatur (Ti) höher oder im Wesentlichen gleich der vorbestimmten Temperatur ist, wobei die zweite Temperaturkurve (temp2) zumindest einen im Wesentlichen linearen Abschnitt (temp2(1)) umfasst, der einem Temperaturbereich (IT) entspricht, wobei der Abschnitt (temp2(1)) eine Steigung (α2) von größerem Wert als der Wert der Steigung (α1) eines Abschnitts (temp1(1)) der ersten Temperaturkurve (temp1) hat, der dem Temperaturbereich (IT) entspricht.
  2. Gargerät nach Anspruch 1, dadurch gekennzeichnet, dass es einen Katalysator (4) zum Neutralisieren von Rauchgasen enthält, die während des Pyrolyse-Reinigungszyklus in dem Hohlraum (2) erzeugt werden, und dass der Pyrolyse-Reinigungszyklus einen ersten Abschnitt (A1i-c, A2i-c) umfasst, in dem die Temperatur des Hohlraums (2) von der Anfangstemperatur (Ti) auf eine Aktivierungstemperatur (Tc) des Katalysators (4) ansteigt, sowie einen zweiten Abschnitt (A1c-p, A2c-p), in dem die Temperatur von der Aktivierungstemperatur (Tc) des Katalysators (4) auf die Pyrolysetemperatur (Tp) ansteigt, wobei der Temperaturbereich (IT) im Wesentlichen dem zweiten Abschnitt (A1c-p, A2c-p) des Pyrolyse-Reinigungszyklus entspricht.
  3. Gargerät nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass es einen Absaugventilator (6) zum Absaugen von Rauchgasen enthält, die während des Pyrolyse-Reinigungszyklus in dem Hohlraum (2) erzeugt werden, sowie Steuermittel zum Steuern des Absaugventilators (6), die dazu ausgelegt sind, im Betrieb den Absaugventilator (6) mit einer Drehzahl anzusteuern, wobei die Drehzahl des Absaugventilators (6) Funktion der Temperatur des Hohlraums (2) ist.
  4. Gargerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Mittel zur Durchführung eines Pyrolyse-Reinigungszyklus Heizmittel (7a, 7b, 8) enthalten, die so ausgelegt sind, dass die Temperatur des Hohlraums (2) gemäß der ersten Temperaturkurve (temp1) oder gemäß der zweiten Temperaturkurve (temp2) ansteigt.
  5. Gargerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die vorbestimmte Temperatur im Wesentlichen gleich 100°C ist.
  6. Gargerät nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es ein Backofen ist.
  7. Pyrolyse-Reinigungsverfahren für ein Gargerät (1) mit einem Hohlraum (2) und zur Durchführung eines Reinigungszyklus durch Pyrolyse, bei dem die Temperatur des Hohlraums von einer Anfangstemperatur (Ti) auf eine Pyrolysetemperatur (Tp) ansteigt, wobei der zeitliche Temperaturanstieg gemäß einer ersten Temperaturkurve (temp1) erfolgt, die für den zeitlichen Verlauf der Temperatur repräsentativ ist, wobei das Pyrolyse-Reinigungsverfahren dadurch gekennzeichnet ist, dass es das Überprüfen (E1) der vorherigen Durchführung eines Garzyklus und das Vergleichen (E2) der Anfangstemperatur (Ti) mit einer vorbestimmten Temperatur umfasst, wobei die Überprüfung (E1) einen Schritt des Bestimmens der zwischen dem Ende eines Garzyklus und dem Beginn des Pyrolyse-Reinigungszyklus verstrichenen Zeitspanne und einen Schritt des Vergleichens der bestimmten verstrichenen Zeitspanne mit einer vorbestimmten Zeitspanne umfasst, wobei der zeitliche Temperaturanstieg gemäß der ersten Temperaturkurve (temp1) dann erfolgt, wenn die Anfangstemperatur (Ti) niedriger als die vorbestimmte Temperatur ist, und gemäß einer zweiten Temperaturkurve (temp2), die für den zeitlichen Verlauf der Temperatur repräsentativ ist, dann erfolgt, wenn zuvor ein Garzyklus durchgeführt worden ist und wenn die Anfangstemperatur (Ti) höher oder im Wesentlichen gleich der vorbestimmten Temperatur ist, wobei die zweite Temperaturkurve (temp2) zumindest einen im Wesentlichen linearen Abschnitt (temp2(1)) umfasst, der einem Temperaturbereich (IT) entspricht, wobei der Abschnitt (temp2(1)) eine Steigung (α2) von größerem Wert als der Wert der Steigung (α1) eines Abschnitts (temp1(1)) der ersten Temperaturkurve (temp1) hat, der dem Temperaturbereich (IT) entspricht.
  8. Pyrolyse-Reinigungsverfahren nach Anspruch 7, dadurch gekennzeichnet, dass der Pyrolyse-Reinigungszyklus einen ersten Abschnitt (A1i-c, A2i-c) umfasst, in dem die Temperatur des Hohlraums (2) von der Anfangstemperatur (Ti) auf eine Aktivierungstemperatur (Tc) eines Katalysators (4) ansteigt, der die Rauchgase neutralisiert, die während des Pyrolyse-Reinigungszyklus in dem Hohlraum (2) erzeugt werden, sowie einen zweiten Abschnitt (A1c-p, A2c-p), in dem die Temperatur von der Aktivierungstemperatur (Tc) des Katalysators (4) auf die Pyrolysetemperatur (Tp) ansteigt, wobei der Temperaturbereich im Wesentlichen dem zweiten Abschnitt (A1c-p, A2c-p) des Pyrolyse-Reinigungszyklus entspricht.
  9. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 oder 8, dadurch gekennzeichnet, dass es das Ansteuern eines Absaugventilators (6) zum Absaugen von Rauchgasen, die während des Pyrolyse-Reinigungszyklus in dem Hohlraum (2) erzeugt werden, mit einer Drehzahl umfasst, die Funktion der Temperatur des Hohlraums (2) ist.
  10. Pyrolyse-Reinigungsverfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Ansteuern des Absaugventilators (6) das Betreiben des Absaugventilators (6) mit einer Mindestdrehzahl umfasst, wenn der Hohlraum (2) sich auf der Anfangstemperatur (Ti) befindet, wobei die Drehzahl des Absaugventilators (6) ansteigt, wenn die Temperatur des Hohlraums (2) ansteigt.
  11. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass es das Steuern der Heizmittel im Betrieb für eine vorbestimmte Zeitspanne und mit einer vorbestimmten Leistung umfasst, so dass die Temperatur des Hohlraums (2) gemäß der ersten Temperaturkurve (temp1) oder gemäß der zweiten Temperaturkurve (temp2) ansteigt.
  12. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 bis 11, dadurch gekennzeichnet, dass die vorbestimmte Temperatur im Wesentlichen gleich 100 °C ist.
  13. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 bis 12, dadurch gekennzeichnet, dass der zeitliche Temperaturanstieg gemäß der zweiten Temperaturkurve (temp2) dann erfolgt, wenn die bestimmte Zeitspanne geringer als eine vorbestimmte Zeitspanne ist.
  14. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 bis 13, dadurch gekennzeichnet, dass das Überprüfen der vorherigen Durchführung eines Garzyklus das Vergleichen (E3) einer Gartemperatur (Tu) während des vorherigen Garzyklus mit einer vorbestimmten Gartemperatur umfasst.
  15. Pyrolyse-Reinigungsverfahren nach Anspruch 14, dadurch gekennzeichnet, dass der zeitliche Temperaturanstieg gemäß der zweiten Temperaturkurve (temp2) dann erfolgt, wenn die Gartemperatur (Tu) höher oder im Wesentlichen gleich der vorbestimmten Gartemperatur ist.
  16. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 7 bis 15, dadurch gekennzeichnet, dass das Überprüfen der vorherigen Durchführung eines Garzyklus das Bestimmen der Garzeit (E4) des Garzyklus und das Vergleichen der bestimmten Garzeit mit einer vorbestimmten Garzeit umfasst.
  17. Pyrolyse-Reinigungsverfahren nach Anspruch 16, dadurch gekennzeichnet, dass der zeitliche Temperaturanstieg gemäß der zweiten Temperaturkurve (temp2) dann erfolgt, wenn die Garzeit höher oder im Wesentlichen gleich der vorbestimmten Garzeit ist.
  18. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 14 bis 17, dadurch gekennzeichnet, dass die vorbestimmte Garzeit im Wesentlichen gleich 140° ist.
  19. Pyrolyse-Reinigungsverfahren nach einem der Ansprüche 14 bis 17, dadurch gekennzeichnet, dass zuvor mehrere Garzyklen durchgeführt wurden, wobei jeder Garzyklus eine zugeordnete Teilgarzeit hat, wobei die Garzeiten der Summe der mehreren Teilgarzeiten entsprechen, wenn die Temperatur des Hohlraums (2) höher als die vorbestimmte Temperatur zwischen der Durchführung der Garzyklen ist.
EP16165786.1A 2015-04-21 2016-04-18 Kochgerat, das einen pyrolytischen reinigungszyklus durchführt und entsprechendes reinigungsverfahren Active EP3086044B1 (de)

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FR1553555A FR3035482B1 (fr) 2015-04-21 2015-04-21 Appareil de cuisson mettant en oeuvre un cycle de nettoyage par pyrolyse

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WO2022184444A1 (de) 2021-03-04 2022-09-09 BSH Hausgeräte GmbH Verfahren zum betreiben eines pyrolysefähigen haushaltsgargeräts

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FR3035482B1 (fr) 2018-09-14
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FR3035482A1 (fr) 2016-10-28

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